black smoke boiler problem

[Agile]

putting it simpley
oilman suspects that air may being drawn via the aga oil suppy.
this will restrict the oil to the burner causing the pump to partialy cavitate
result under fueling
over aired

My natural reasoning is that all those things would cause a weak mixture.

Whereas black smoke is to me a symptom of too rich a mixture! As might be caused by a fan running a bit slow.

But then Oilman specialises in oil boilers and I now only see the odd one or two a year.

Tony

 

[Softus]

I take it all back. If Agile's agreeing with me then I must have been wrong.

 

[WDIK]

good reasoning except
over airing can cause impingement which should result in white smoke
but in a limited domestic chamber all sort can happen

 

[Agile]

I thought that white smoke was atomised unburnt fuel?

This is very clearly described as BLACK smoke!

To me it indicates a togle to a second stable incorrect combustion condition as might be caused by a fan running at a stable reduced speed.

I still cannot work out why after five days though! Its a bit like that thermocouple which gives out every Thursday!

Tony

 

[apcosantana]

My girlfriend had a brand new VW Passat which broke down with an ignition fault, three times, all on a Friday!

 

[Agile]

My girlfriend had a brand new VW Passat which broke down with an ignition fault, three times, all on a Friday!

Do you mean it broke down three times on the same Friday?

Or do you mean it broke down on three different Fridays?

If its the latter then thats easily explainable! She would have to wait until the following Mondays to get it fixed.

Its sods law that things always break down when they cannot be fixed quickly!

Tony

 

[WDIK]

generally what oilman is infering a suspicion of is this,
somewhere and it could be the aga, air is being drawn into the oil line supplying the burner.
this will cause partial cavitation in the pump causing an occaisional foam fuel mix being sent to the nozzle resulting in a weakened unstable flame.

white smoke indicates over airing
black smoke indicates under airing

soot can result in both events.

 

[Softus]

...one month after an oil tank fill and the service we had belching black smoke out of the top of the flue.

...if anything this is under fueled not under aired.

putting it simpley
oilman suspects that air may being drawn via the aga oil suppy.
this will restrict the oil to the burner causing the pump to partialy cavitate
result under fueling
over aired

...over airing can cause impingement which should result in white smoke...

somewhere and it could be the aga, air is being drawn into the oil line supplying the burner.

black smoke indicates under airing

Oh, oh, the hokey cokey...

 

[doitall]

Well as I don't think the Aga has anything to do with the problem, I would look at the ignition.

Electrode and leads for damage.
Flexible for damage.
Atomiser nozzle for wear.
Magnetic valve.
Pump.

A readout in the fault condition would tell a lot

But what do I know

 

[numpty1]

Well as I don't think the Aga has anything to do with the problem, I would look at the ignition.

Electrode and leads for damage.
Flexible for damage.
Atomiser nozzle for wear.
Magnetic valve.
Pump.

A readout in the fault condition would tell a lot

But what do I know

A READOUT IN THE FAULT CONDITION WOULD BLOW THE KANE 400 smoke pumps do not do printouts yet

 

[doitall]

Well as I don't think the Aga has anything to do with the problem, I would look at the ignition.

Electrode and leads for damage.
Flexible for damage.
Atomiser nozzle for wear.
Magnetic valve.
Pump.

A readout in the fault condition would tell a lot

But what do I know

A READOUT IN THE FAULT CONDITION WOULD BLOW THE KANE 400 smoke pumps do not do printouts yet

Why should it do that

 

[numpty1]

black smoke would poison the o2 cell as you should know

 

[doitall]

black smoke would poison the o2 cell as you should know

Not if you tweak the air open a notch.

The boiler is deteriorating over 5 days, that to me suggests an combustion problem. For example if the Magnetic valve was sticking and not shutting down quickly, unburnt oil could build up in the chamber which then soots up and bingo black smoke.

The pump on the blink and the wrong size nozzle would be worth checking

 

[oilman]

PFFFT

 

[Softus]

I would still want to check the capacitor value when the boiler is in the faulty state.